.middle > div {
    border: 1px solid rebeccapurple;
}

.middle > div > div {
    padding: 10px;
}

/*--------------------------*/
.detail {
    display: flex;
    justify-content: center;
}

.detail > div > div:nth-child(1) > div:nth-child(1) {
    display: flex;
    justify-content: center;
}

.detail > div > div:nth-child(1) > div:nth-child(1) > div:nth-child(1) {
    display: flex;
}

.detail > div > div:nth-child(1) > div:nth-child(1) > div:nth-child(1) > div:nth-child(1) {
    color: rgb(230, 145, 55);
}

.detail > div > div:nth-child(1) > div:nth-child(1) > div:nth-child(1) > div:nth-child(2) {
    color: gray;
}

.detail > div > div:nth-child(1) {
    margin: 30px 0;
}

/*-------------------------------------------*/
.detail > div > div:nth-child(2) {
    display: flex;
    justify-content: center;
}

.detail > div > div:nth-child(2) > div {
    width: 600px;
}

/*分组选择器*/
input, textarea {
    width: 600px;
    border: 1px dashed rebeccapurple;
}

input {
    line-height: 30px;
}

textarea {
    height: 100px;
}

.detail > div > div:nth-child(2) > div > div:nth-child(1) > div > div {
    line-height: 30px;
}

/*----------提交----------*/
button {
    background-color: orange;
    padding: 10px 50px;
    border: none;
    color: white;
    cursor: pointer;
}

.detail > div > div:nth-child(2) > div > div:nth-child(2) {
    display: flex;
    justify-content: center;
    margin: 30px;


}